Arc-lamp.



Patented Oct. I0, |899. J. A. DAVIES.

A R C L A M P.

(Application led Oct. 29, 1898.)

'(No Model.)

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SPECIFICATION forming part of Letters a'tent No. 634,849, dated October 10, 189%?.

Application tiled October 29, 1898. Serial No. 694,936. (le model.)

To (0M 'Lr/700111, it may concern:

Beit known that I, JOHN A. Dnvrns, a citizen of theUnited States of America, and a resident of Cleveland, county of Cuyahoga, State of Ohio, have invented certain new and useful Improvements in Arc-Lamps, of which the following is a speciiication.

The objects of my invention are to provide means for controiling the movements of the -upper carbon, to give the minimum amount of variation in the are, and to obtain the maximum amount of power in the controlling mechanism.

My object is also to increase the simplicity of all the working parts of the lamp.

My invention consists in the employment of one or more double-cored solenoids, the cores of which work in unison to operate the clutches which control the action of the upper carbon.

My invention also has reference to the construction of the clutches and intermediate mechanism whereby the carbon is controlled, and to the detailsof construction and combination and arrangement of parts, as hereinafter described, shown in the accompanying drawings, and specifically pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical central section of the lamp. Figs. 2 and 3 are details.

In the igures, 1 is a central disk or plate upon which the supports for the working parts of the lamp are mounted. 2 is a depending arm therefrom, upon which are supported the sleeve 3, the lower carbon 4f, and `globe 5, provided with a cover G, through which projects the upper carbon 7, a partial vacuum being formed within the globe 5 as soon as the heated are drives out the air therein. The outer globe 8 also rests upon the nut or ring il, which is supported upon the extremity of the sleeve 3.

The operative and controlling mechanism for the lamp is placed above the plate 1 and may be described as follows:

A and B are solenoids of equal power connected in series in the lamp-circuit and elevated above the plate 1 upon the platl'orm 10, beneath which are placed the clutch-dogs and their operative mechanism.

12 is a metal tube or stem secured centrally in the platform 10, within which is placed the carbon tube or holder 13, the outer tube being separated out of contact therewith by insulation, as shown at 1st. The inner tube, however, is supported upon the stem by means of a cross-pin 15 at the upper extremity, the upper carbon 7 being loosely held in the inner tube. Upon the upper extremity of the stem is secured a plate 1C, upon which are seen the binding-posts for the main circuit as it enters and leaves the lamp. Also supported upon this stem is seen a frame 17, upon which the resistance-coil 18 is mounted, spools 19 confining the coil to the upper portion of the lamp. rllhis frame consists of arms 30 and vertical strips 10.

The clutch mechanism and the operative mechanism therefor are as follows:

The solenoids A and B are provided cach with two (upper and lower) movable cores, as 2O and 21, moving iu opposite directions. To the projecting extremities of the lower cores are pivoted the lever-arms 22 of the clutchdogs 23, pivoted at 24 upon either side ot' the ring` 25, which loosely encircles the upper earbon. A rigid bar 2G connects the lower cores, so that their movements will coincide.

It will be seen that the pressure of the dogs will vary with the oscillatory movement of the cores, which will raise and lower the clutch-levers to grip and release the carbon simultaneously upon either side.

The upper cores 21 exert substantially the same power as the lower and are connected by intermediate link mechanism with the cross-bar 2G, so as to add their influence to the controlling power of the lover cores. As shown, this link mechanism consists of pivoted rock-arms 27 and rods 28, pivoted thoreto and to the extremities of the bar 26.

The cross-bar 2U is preferably formed of soft iron and then serves as an armature, assisting to hold the clutch and also serves to limit the upper movement of the clutch and carbon to the greatest length of arc desired.

The operation of the device is as follows: The current entering the lamp through thc resistance-coil is reduced in strength to accommodate the arc required and then passes through the solenoids A and B in series into one of the clutch-levers. It then passes through the carbone and returns through the IOO depending,` arm and second binding-post at the top of the lamp.

The use of the double cores utilizes all the strength of each solenoid, the upper core aug'- menting the strength of the lower one, and thus avoids the employment of a great depth of coil upon the solenoids to obtain the necessary power and the consequent danger of overheating them, together with the accompanying' luctnation of the current caused thereby. Again, the greater strength obtained assures increased power of control of the carbon with a known voltage of the current, and thereby an increased steadiness in the arc.

lt will readilybe seen that one solenoid provided with two cores could be employed to operate a suitable form of clutch, as a ringrclutch; but l find that two solenoids, each provided with two cores and operating two oppositely-placed clutches or dogs, will provide the most powerful and sensitive mode of control for the carbon, while balancing` the carbon most elliciently.

In Figs. l and it it will be seen that the clutch doe' is hollowed on the `grippingfface,thus providing,` two contact-points U and D, the action of which is as follows: At the period of rest, as shown in Fig. l, the lower point will be seen to be in contact and the upper one entirely out of contact. As soon as the current is turned into the lamp it passes into the carbon through the lower point and magnetizes the solenoid, which then raises the clutchlever and at once brings the upper point into contact, while releasing the lower, the ad vautage of which is that a constant contact is formed with the carbon and the lamp is always in the circuit when at rest, and, furthermore, the contact being made with points ot' perfect contact there are no surfaces to fuse or stick to the carbon.

Many slight changes in construction may be made without departing` from the spirit of my invention. For instance, the upper core could be connected directly with the clutchlever, or both upper cores could be omitted, or anychanges in detail could be made which do not altect the generic character of thc mechanism. l believe myself, however, to be the first to employ one or more solenoids having,` two oppositely-nioving cores to control the movements of the carbon.

' Having` described my invention, what l claim as new, and desire to secure by Letters Patent, is-

l. ln carbon-controlling mechanism in an arc-lamp, the combination with a solenoid provided with upper and lower cores independently movable therein, of a clutch constructed to raise the carbon, and intermediate mechanism connecting,` the said cores with the said. clutch whereby both said cores work in unison to raise the carbon7 substantially as described.

2. In carbon-controlling` mechanism for an ceases arc-lamp, means for controlling one ofthe carbons, consisting of a solenoid within the lampcircuit, provided with independent upper and lower cores, in combination with a pivoted clutch-jaw, engaging the carbon and pivotally secured to the said lower core, and link mechanism connecting` the upper and lower cores, whereby the said cores will workin unison to operate the clutch-lever, substantially as described.

3. In carbon-controlling mechanism for an arc-lamp7 the combination with a clutch adapt` ed to raise the carbon, of a plurality ol' solenoids, each provided with upper and lower cores independently movable therein, all said cores bein r connected by intermediate mechanism with said clutch, whereby they workin unison to raise the carbon, substantially as described.

l. In means forcontrolling,` the movements of the upper carbon in an arc-lamp, two clutch-dogs arranged upon either side of the carbon and provided with extended levers, in combination with two solenoids upon either side oi" the carbon, upper and lower cores in each of the solenoids, a rigid bar connecting the lower cores, link mechanism connecting,l each upper core with its corresponding lower core, and pivotal connections between the lower cores and the correspondinu` clutch-levers, substantially as set forth.

5. In mechanism for the purpose described, a clutch-ring` encircling the upper carbon, doubly-pointed dogs, provided with extended levers and pivoted upon said ring` upon either side of 'the carbon, in combination with solenoids provided each with upper and lower cores, constructed to move in opposite directions, and intermediate mechanism operatively connecting` said cores with the clutchlevers, substantially as set forth.

6. In carbon-controlling mechanism ior an arc-lamp the combination with a clutch'lever, of two solenoids, provided cach with upper and lower movable cores, the upper and lower cores in said solenoids being` connected together respectively by rigid bars, and the said bars being; connected together and with the clutch by linl; mechanism, whereby the said coies will work in unison to operate the said clutch-lever, substantially as described.

7. In carbon-controlling' mechanism for an arc-lamp, two solenoids introduced in series in the lamp-circuit, in combination with upper and lower movable cores each therein, said lower cores being rigidly con nected together by a cross-bar, and all working in unison, substantially as set forth.

Signed by me at Cleveland, Ohio, this llih day ol' June, 1808.

JOHN d. lMllVllilS.

lVitnesses:

Wir. M. MONROE, JOHN H. BEHR.

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